Finding the Fourth Proportional to 31,470.42, 47,225.55 and 28,514.89

Step by Step Solution

1. Step 1: Write the proportion equation
   31,470.42 : 47,225.55 = 28,514.89 : x
2. Step 2: Convert to fraction form
   31,470.42/47,225.55 = 28,514.89/x
3. Step 3: Cross multiply
   31,470.42x = 47,225.55 × 28,514.89
4. Step 4: Simplify right side
   31,470.42x = 1,346,631,127.31
5. Step 5: Solve for x
   x = 1,346,631,127.31/31,470.42
6. Step 6: Final answer
   x = 42,790.38